1 /* 2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 #ifndef SHARE_VM_MEMORY_METASPACE_SHARED_HPP 25 #define SHARE_VM_MEMORY_METASPACE_SHARED_HPP 26 27 #include "memory/allocation.hpp" 28 #include "memory/memRegion.hpp" 29 #include "runtime/virtualspace.hpp" 30 #include "utilities/exceptions.hpp" 31 #include "utilities/macros.hpp" 32 33 class FileMapInfo; 34 35 // Class Data Sharing Support 36 class MetaspaceShared : AllStatic { 37 38 // CDS support 39 static ReservedSpace* _shared_rs; 40 static int _max_alignment; 41 static bool _link_classes_made_progress; 42 static bool _check_classes_made_progress; 43 static bool _has_error_classes; 44 static bool _archive_loading_failed; 45 public: 46 enum { 47 vtbl_list_size = 17, // number of entries in the shared space vtable list. 48 num_virtuals = 200 // maximum number of virtual functions 49 // If virtual functions are added to Metadata, 50 // this number needs to be increased. Also, 51 // SharedMiscCodeSize will need to be increased. 52 }; 53 54 enum { 55 ro = 0, // read-only shared space in the heap 56 rw = 1, // read-write shared space in the heap 57 md = 2, // miscellaneous data for initializing tables, etc. 58 mc = 3, // miscellaneous code - vtable replacement. 59 n_regions = 4 60 }; 61 62 // Accessor functions to save shared space created for metadata, which has 63 // extra space allocated at the end for miscellaneous data and code. 64 static void set_max_alignment(int alignment) { 65 CDS_ONLY(_max_alignment = alignment); 66 } 67 68 static int max_alignment() { 69 CDS_ONLY(return _max_alignment); 70 NOT_CDS(return 0); 71 } 72 73 static void prepare_for_dumping() NOT_CDS_RETURN; 74 static void preload_and_dump(TRAPS) NOT_CDS_RETURN; 75 static int preload_and_dump(const char * class_list_path, 76 GrowableArray<Klass*>* class_promote_order, 77 TRAPS) NOT_CDS_RETURN; 78 79 static ReservedSpace* shared_rs() { 80 CDS_ONLY(return _shared_rs); 81 NOT_CDS(return NULL); 82 } 83 84 static void set_shared_rs(ReservedSpace* rs) { 85 CDS_ONLY(_shared_rs = rs;) 86 } 87 88 static void set_archive_loading_failed() { 89 _archive_loading_failed = true; 90 } 91 static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false); 92 static void initialize_shared_spaces() NOT_CDS_RETURN; 93 94 // Return true if given address is in the mapped shared space. 95 static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false); 96 97 static void generate_vtable_methods(void** vtbl_list, 98 void** vtable, 99 char** md_top, char* md_end, 100 char** mc_top, char* mc_end); 101 static void serialize(SerializeClosure* sc); 102 103 // JVM/TI RedefineClasses() support: 104 // Remap the shared readonly space to shared readwrite, private if 105 // sharing is enabled. Simply returns true if sharing is not enabled 106 // or if the remapping has already been done by a prior call. 107 static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true); 108 109 static void print_shared_spaces(); 110 111 static bool try_link_class(InstanceKlass* ik, TRAPS); 112 static void link_one_shared_class(Klass* obj, TRAPS); 113 static void check_one_shared_class(Klass* obj); 114 static void link_and_cleanup_shared_classes(TRAPS); 115 }; 116 #endif // SHARE_VM_MEMORY_METASPACE_SHARED_HPP